2012-08-18 11:49:47 +00:00
|
|
|
/*
|
|
|
|
* Copyright (c) 2012 Nicolas George
|
|
|
|
*
|
|
|
|
* This file is part of FFmpeg.
|
|
|
|
*
|
|
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
|
|
* modify it under the terms of the GNU Lesser General Public License
|
|
|
|
* as published by the Free Software Foundation; either
|
|
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
|
|
*
|
|
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
* GNU Lesser General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
|
|
* along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
|
|
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
*/
|
|
|
|
|
2012-11-13 13:16:48 +00:00
|
|
|
#include "libavutil/channel_layout.h"
|
2012-08-18 11:49:47 +00:00
|
|
|
#include "libavutil/avassert.h"
|
|
|
|
#include "audio.h"
|
|
|
|
#include "avfilter.h"
|
|
|
|
#include "internal.h"
|
|
|
|
|
2017-05-12 18:00:49 +00:00
|
|
|
typedef struct VolDetectContext {
|
2012-08-18 11:49:47 +00:00
|
|
|
/**
|
|
|
|
* Number of samples at each PCM value.
|
|
|
|
* histogram[0x8000 + i] is the number of samples at value i.
|
|
|
|
* The extra element is there for symmetry.
|
|
|
|
*/
|
|
|
|
uint64_t histogram[0x10001];
|
|
|
|
} VolDetectContext;
|
|
|
|
|
|
|
|
static int query_formats(AVFilterContext *ctx)
|
|
|
|
{
|
2012-12-21 22:38:59 +00:00
|
|
|
static const enum AVSampleFormat sample_fmts[] = {
|
2012-08-18 11:49:47 +00:00
|
|
|
AV_SAMPLE_FMT_S16,
|
|
|
|
AV_SAMPLE_FMT_S16P,
|
|
|
|
AV_SAMPLE_FMT_NONE
|
|
|
|
};
|
2021-08-09 23:25:31 +00:00
|
|
|
int ret = ff_set_common_all_channel_counts(ctx);
|
2016-09-05 19:42:31 +00:00
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
2021-08-09 23:25:31 +00:00
|
|
|
return ff_set_common_formats_from_list(ctx, sample_fmts);
|
2012-08-18 11:49:47 +00:00
|
|
|
}
|
|
|
|
|
2013-03-10 00:30:30 +00:00
|
|
|
static int filter_frame(AVFilterLink *inlink, AVFrame *samples)
|
2012-08-18 11:49:47 +00:00
|
|
|
{
|
|
|
|
AVFilterContext *ctx = inlink->dst;
|
|
|
|
VolDetectContext *vd = ctx->priv;
|
2013-03-10 00:30:30 +00:00
|
|
|
int nb_samples = samples->nb_samples;
|
2017-04-22 08:57:18 +00:00
|
|
|
int nb_channels = samples->channels;
|
2012-10-11 01:12:40 +00:00
|
|
|
int nb_planes = nb_channels;
|
2012-08-18 11:49:47 +00:00
|
|
|
int plane, i;
|
|
|
|
int16_t *pcm;
|
|
|
|
|
|
|
|
if (!av_sample_fmt_is_planar(samples->format)) {
|
|
|
|
nb_samples *= nb_channels;
|
|
|
|
nb_planes = 1;
|
|
|
|
}
|
|
|
|
for (plane = 0; plane < nb_planes; plane++) {
|
|
|
|
pcm = (int16_t *)samples->extended_data[plane];
|
|
|
|
for (i = 0; i < nb_samples; i++)
|
|
|
|
vd->histogram[pcm[i] + 0x8000]++;
|
|
|
|
}
|
|
|
|
|
2012-11-28 12:53:48 +00:00
|
|
|
return ff_filter_frame(inlink->dst->outputs[0], samples);
|
2012-08-18 11:49:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
#define MAX_DB 91
|
|
|
|
|
|
|
|
static inline double logdb(uint64_t v)
|
|
|
|
{
|
|
|
|
double d = v / (double)(0x8000 * 0x8000);
|
|
|
|
if (!v)
|
|
|
|
return MAX_DB;
|
2015-10-29 04:12:53 +00:00
|
|
|
return -log10(d) * 10;
|
2012-08-18 11:49:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void print_stats(AVFilterContext *ctx)
|
|
|
|
{
|
|
|
|
VolDetectContext *vd = ctx->priv;
|
|
|
|
int i, max_volume, shift;
|
|
|
|
uint64_t nb_samples = 0, power = 0, nb_samples_shift = 0, sum = 0;
|
|
|
|
uint64_t histdb[MAX_DB + 1] = { 0 };
|
|
|
|
|
|
|
|
for (i = 0; i < 0x10000; i++)
|
|
|
|
nb_samples += vd->histogram[i];
|
|
|
|
av_log(ctx, AV_LOG_INFO, "n_samples: %"PRId64"\n", nb_samples);
|
|
|
|
if (!nb_samples)
|
|
|
|
return;
|
|
|
|
|
|
|
|
/* If nb_samples > 1<<34, there is a risk of overflow in the
|
|
|
|
multiplication or the sum: shift all histogram values to avoid that.
|
|
|
|
The total number of samples must be recomputed to avoid rounding
|
|
|
|
errors. */
|
|
|
|
shift = av_log2(nb_samples >> 33);
|
|
|
|
for (i = 0; i < 0x10000; i++) {
|
|
|
|
nb_samples_shift += vd->histogram[i] >> shift;
|
|
|
|
power += (i - 0x8000) * (i - 0x8000) * (vd->histogram[i] >> shift);
|
|
|
|
}
|
|
|
|
if (!nb_samples_shift)
|
|
|
|
return;
|
|
|
|
power = (power + nb_samples_shift / 2) / nb_samples_shift;
|
|
|
|
av_assert0(power <= 0x8000 * 0x8000);
|
|
|
|
av_log(ctx, AV_LOG_INFO, "mean_volume: %.1f dB\n", -logdb(power));
|
|
|
|
|
|
|
|
max_volume = 0x8000;
|
|
|
|
while (max_volume > 0 && !vd->histogram[0x8000 + max_volume] &&
|
|
|
|
!vd->histogram[0x8000 - max_volume])
|
|
|
|
max_volume--;
|
|
|
|
av_log(ctx, AV_LOG_INFO, "max_volume: %.1f dB\n", -logdb(max_volume * max_volume));
|
|
|
|
|
|
|
|
for (i = 0; i < 0x10000; i++)
|
|
|
|
histdb[(int)logdb((i - 0x8000) * (i - 0x8000))] += vd->histogram[i];
|
|
|
|
for (i = 0; i <= MAX_DB && !histdb[i]; i++);
|
|
|
|
for (; i <= MAX_DB && sum < nb_samples / 1000; i++) {
|
|
|
|
av_log(ctx, AV_LOG_INFO, "histogram_%ddb: %"PRId64"\n", i, histdb[i]);
|
|
|
|
sum += histdb[i];
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-05-06 14:55:06 +00:00
|
|
|
static av_cold void uninit(AVFilterContext *ctx)
|
2012-08-18 11:49:47 +00:00
|
|
|
{
|
2012-10-17 17:42:20 +00:00
|
|
|
print_stats(ctx);
|
2012-08-18 11:49:47 +00:00
|
|
|
}
|
|
|
|
|
2012-11-28 19:01:59 +00:00
|
|
|
static const AVFilterPad volumedetect_inputs[] = {
|
|
|
|
{
|
2013-09-07 12:13:50 +00:00
|
|
|
.name = "default",
|
|
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
|
|
.filter_frame = filter_frame,
|
2012-11-28 19:01:59 +00:00
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
static const AVFilterPad volumedetect_outputs[] = {
|
|
|
|
{
|
|
|
|
.name = "default",
|
|
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
2021-04-19 16:33:56 +00:00
|
|
|
const AVFilter ff_af_volumedetect = {
|
2012-08-18 11:49:47 +00:00
|
|
|
.name = "volumedetect",
|
|
|
|
.description = NULL_IF_CONFIG_SMALL("Detect audio volume."),
|
|
|
|
.priv_size = sizeof(VolDetectContext),
|
|
|
|
.query_formats = query_formats,
|
2012-10-17 17:42:20 +00:00
|
|
|
.uninit = uninit,
|
2021-08-12 11:05:31 +00:00
|
|
|
FILTER_INPUTS(volumedetect_inputs),
|
|
|
|
FILTER_OUTPUTS(volumedetect_outputs),
|
2012-08-18 11:49:47 +00:00
|
|
|
};
|